UI Toolkit + WebGL + iOS issue on Unity 6

Has anyone else tried to get UI Toolkit working on WebGL + iOS using Unity 6?

I’m on the latest version (6000.0.31f1) at time of writing and when running on iOS in Safari (or other browsers), the UI either fails to appear (black screen) or if it does, it either isn’t responsive or it renders incorrectly.

This can happen on the simplest screens to the most complex.

Sometimes I get an error popup right after Unity loads.

Sometimes, for whatever reason, a simple UI screen might work but the next screen will cause an error popup or cause the screen to go black.

This could be a bug, please submit a bug report in Help>Report a bug so QA can investigate. Once submitted, please post the case ID here so we can track it from here. Thanks!